<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Chemical Equation for Water</title>
</head>
<body>
<p>The chemical equation for water is:</p>
<p>H<sub>2</sub>O</p>
</body>
</html>
To display the chemical equation for water (H2O) using HTML, you can use the `<sub>` and `<sup>` tags for subscript and superscript, respectively. Here's an example:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Chemical Equation for Water</title>
</head>
<body>
<p>The chemical equation for water is:</p>
<p>H<sub>2</sub>O</p>
</body>
</html>
```
In the example, `<sub>` is used for the subscript "2" in H2O. You can copy and paste this code into an HTML file and open it in a web browser to see the displayed chemical equation for water.
